TV news was no friend to those of us who had small children in the 1980s. Allegations of child sexual abuse in day-care centers swept the nation, with high-profile cases in California, North Carolina, New Jersey, Massachusetts, Minnesota and other states, leading to empty playgrounds, hyper-vigilant parents and the implication that behind every tree lurked a pedophile waiting to snatch our children. Sexual abuse is an awful crime, but the perpetrators are usually relatives or family friends,...